public class Example25 {
    public static void main(String[] args) {
        int[] arr;
        arr = new int[4];
        System.out.println("arr[0]="+arr[0]);
        System.out.println("arr[1]="+arr[1]);
        System.out.println("arr[2]="+arr[2]);
        System.out.println("arr[3]="+arr[3]);
        System.out.println("数组的长度是："+arr.length);

    }
}
